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Complaint feedback loops checklist for 2026

Short answer

A complete complaint feedback loops checklist has 4 setup items and 2 things to audit against. Work through setup in order, then schedule a quarterly review.

Setup checklist#

  • ☐ Register your sending IPs and domains with each provider's FBL.
  • ☐ Route FBL messages to an automated parser.
  • ☐ Suppress every complainer from all future marketing.
  • ☐ Report complaint rate per campaign and per acquisition source.

Audit checklist#

  • ☐ Confirm you are not: registering but never processing the reports.
  • ☐ Confirm you are not: gmail has no traditional FBL; use Postmaster Tools spam rate instead.

Ongoing monitoring#

  • ☐ Weekly: review provider dashboards (Postmaster Tools, SNDS) and bounce logs
  • ☐ Monthly: re-run the setup verification after any vendor or DNS change
  • ☐ Quarterly: full audit against this checklist

Frequently asked questions#

Does Gmail offer a feedback loop?

Only an aggregate one via Postmaster Tools using the Feedback-ID header. Gmail does not return individual complaints.

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